Improved the CMakeLists.txt just slightly. Provided a default, weak-attributed main function into libdeepstate so that tests don't need to define them. The weak attribute means that any main function defined by libfuzzer will be a strong symbol and take over, so there won't be a conflict. Adjusted examples accordingly to omit now redundant conditionally-compiled main functions, as that leaked out too many underlying details.

examples/Euler.cpp

@@ -39,9 +39,3 @@ TEST(Euler, SumsOfLikePowers) {
       << "^5 + " << d << "^5 = " << e << "^5";
 }
 
-#ifndef LIBFUZZER
-int main(int argc, char *argv[]) {
-  DeepState_InitOptions(argc, argv);
-  return DeepState_Run();
-}
-#endif